Every n-Tree index contains a sub-tree that indexes the summarized data which has the following characteristics:- it contains a sub-tree for each dimension of the cube;- each sub-tree corresponding to a dimension has a structure similar to a BTree index and indexes all the values pertaining to the respective dimension;- the index blocks of the sub-trees contain references to the lower level index blocks;- the index leaf blocks do not contain references to other indexing blocks;
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